Symptoms

Unable to activate Windows 10, a similar error appears:

Cause

User Account Control (UAC) confirmation window does not appear, even if the specific sound was played.

Resolution

Change UAC settings to Always Notify:

1. Open the Control Panel.

   Right-click on Start menu and choose Control Panel or press Command+R combination on the keyboard and type:

   control
   

   then hit Enter.

2. Click on User Accounts icon.

   NOTE: If your Control Panel looks like this:

   

   Click on User Accounts, then on User Accounts icon one more time.

3. Click on Change User Account Control settings link.

   

4. Move the slider up to Always Notify.

   

5. Close UAC window and try to activate Windows one more time.